a-a a-b aaa aab aah aas aay ab- aba abb abh abs aby aha ahb ahh ahs ahy as- asa asb ash ass asy ay- aya ayh ays baa bab bah bas bay bba bbb bbh bbs bby bha bhb bhh bhs bsa bsb bsh bss bsy by- bya byh bys haa hab hah has hay hba hbb hbh hbs hby hha hhb hhh hhs hhy hsa hsb hsh hss hsy hy- hya hyb hyh hys hyy saa sab sah sas say sba sbb sbh sbs sby sh- sha shb shh shs shy ss- ssa ssb ssh sss sy- sya syb syh sys yaa yab yah yas yay ybs yby yha yhs ysa ysb yss ysy yyb yys yyy